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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '738492fe328a993dadfef6cfed43466cd24ba8f9aaf9973fc1bcd951046f7c1c' 
  AND token = '1L+RLoBEVCvpZm1kVCv8l9h7qy1rraSxaY6Iy/sNJd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}